Q Can using a computer damage my eyes?

Dr. Matossian: No, but looking at a computer screen for long periods of time can fatigue or strain your eyes, causing burning, blurred vision or headaches.

Q How can I prevent computer eyestrain?

Dr. Matossian: If you wear glasses, having the proper prescription is important if you spend a lot of time on a computer. Most glasses correct either distance vision or close vision. A computer screen is usually 24 to 26 inches away from your eyes, in the intermediate range.

If you wear bifocals, you might have to cock your neck to see the screen through the lower part of the lens. Progressive lenses adjust to different distances without lines like traditional bifocals and can help relieve computer eyestrain.

If you are straining your eyes, visit an ophthalmologist - a physician who specializes in eye care - for a complete eye examination. Symptoms you assume are eyestrain might be signs of an eye disease such as cataracts or glaucoma.

Q What else can I do?

Dr. Matossian: Keep a bottle of artificial tears, available over-the-counter, handy and use it whenever your eyes feel dry, gritty or sandy. Take occasional breaks to rest your eyes. Good lighting is important but should not be aimed directly at your monitor since that will create glare. If you can't adjust your light source, an antiglare coating on your eyeglasses can help.

Q Will I need another pair of glasses for the computer?

Dr. Matossian: No. A good optician can help you pick the right shape lens with a wide enough intermediate corridor. Be sure to mention that you spend a lot of time on the computer. Good progressive lenses are worth the investment.

Dr. Matossian is a member of Doylestown Hospital's staff.